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McCusker AI Systems

For the technical reader. Under the hood.

Every line on this page is backed by code that exists and runs. A business owner never needs to read it. If you're the technical friend they asked to look me over, this one's for you.

  • TypeScript end to end

    Next.js and React on the web, React Native with Expo on the phone, Node on the server.

  • Postgres with Prisma

    Rate limits and counters live in the database, not in memory, so they survive a deploy.

  • Background work

    Agents on a cron schedule, Twilio webhooks with status callbacks, a supervisor that keeps long jobs up.

  • Security as a habit

    Phone-verified sign-in, server-side gates that read the database, input validation, secrets in the environment, visitor text treated as untrusted.

  • Tested, reviewed, shipped

    Unit and integration tests where it matters, guard tests that catch whole classes of drift, Playwright end to end, pull requests, Vercel from the command line.

  • LLM plumbing in production

    Tool calling, structured outputs, streaming, server-side fallbacks, an eval loop. RAG, MCP and agent memory are in my notebook, linked below.

One small system, end to end

Built for myself · runs every morning

The job line

Finds the jobs worth applying to every morning, scores them, writes the application and the cover letter, and chases each one from a Telegram chat. Follow-ups are drafted and sent on one word.

It hasn't missed one.

  • Python
  • Playwright
  • Claude
  • Telegram
  • Gmail

Tools I work with

  • TypeScript
  • Next.js
  • Expo
  • Prisma
  • Zod
  • Stripe
  • WhatsApp
  • Gmail
  • Microsoft 365
  • Resend
  • Vitest
  • GitHub Actions
  • Python
  • Docker
  • Microsoft Azure
  • QuickBooks
  • ChatGPT · Codex
  • xAI Grok
  • Node.js
  • React
  • PostgreSQL
  • Neon
  • Tailwind CSS
  • Twilio
  • Telegram
  • Google Calendar
  • Claude
  • Playwright
  • GitHub
  • Vercel
  • SQLite
  • Google Cloud
  • Railway
  • Ollama
  • Llama 3.1 via Ollama

Seen enough to picture it in your business?

Fifteen minutes on a call. Tell me the one job that eats your evenings and you'll leave with a straight answer on whether it's a fit and what it would take.

Book a free scope call
Book a free scope call